Snapshot Download REST API

[lorthirk]

This PR introduces GET /device/{deviceId}/snapshots/{snapshotId} to get a single Snapshot from the Device

Related Issue
No related issue

[codecov]

Codecov Report

Merging #2817 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #2817   +/-   ##
==========================================
  Coverage      57.57%   57.57%           
- Complexity      3501     3502    +1     
==========================================
  Files           1074     1074           
  Lines          30517    30517           
  Branches        2437     2437           
==========================================
  Hits           17570    17570           
- Misses         11773    11777    +4     
+ Partials        1174     1170    -4

Impacted Files	Coverage Δ	Complexity Δ
...ransport/mqtt/pooling/PooledMqttClientFactory.java	90% <0%> (-3.34%)	6% <0%> (-1%)
...egistry/event/internal/DeviceEventServiceImpl.java	75% <0%> (-1.79%)	14% <0%> (+1%)
...a/service/device/registry/internal/DeviceImpl.java	65.18% <0%> (-0.75%)	58% <0%> (-1%)
...a/job/engine/jbatch/listener/KapuaJobListener.java	91.66% <0%> (+1.38%)	29% <0%> (+1%)	⬆️
...rtz/persistence/KapuaQuartzConnectionProvider.java	100% <0%> (+12.5%)	5% <0%> (+1%)	⬆️

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